Lock device



2 S heets Sheet '1 E. N. JACOB! Ldcx DEVICE Original. Filed Sept. 5,1941 Aug. 29, 1944.

E. N. JACOB! LOCK DEVICE Aug. 29,

2 Sheets- Sheet 2 Original Filed Sept; 5, 1941 EdwardA/L/Eadbz PatentedAug. 29, 1944 LOCK DEVICE Edward N. Jacobi, Milwaukee, Wis., assignor toBriggs & Stratton Corporation, Milwaukee, Wis, a corporation of DelawareOriginal application September 5, 1941, Serial No. 409,611. Divided andthis application April 3, 1942, Serial No. 437,547

22 Claims.

This invention relates to looks and refers particularly to door latchlocks of the type shown inPatent No. 2,208,003, issued to E. N. Jacobi,July 16, 1940, and is a division of the copending Application, SerialNo. 409,611 filed September 5, 1941. now Patent No. 2,318,490.

In lock devices of the type here under consideration, as well as inother tumbler looks, it is desirable that the cylinder be removable.Various devices have been employed in the past for removably securingthe cylinder in its casing, but in general they all embody a springpressed detent carried either by the cylinder or the easing andextending across the juncture therebetween to engage with an abutment orshoulder from which the detent must be freed to permit withdrawal of thecylinder.

It is also the practice in tumbler locks of the character described toretain the individual tumbler springs either by individual retainers ormore suitably by means of a single retainer fixed to the cylinder withportions thereof disposed over the tumbler springs.

With a view toward minimizing the number of parts, the present inventionhas as one of its objects the provision of a novel manner of combiningthe functions of retaining the tumbler springs and removably holding thecylinder in its casing.

To this end, it is an object of this invention to provide a novelcombined tumbler spring retainer and cylinder retaining member sodesigned and assembled with the cylinder that the reaction of thetumbler springs holds this combined retainer in an operative positionprojecting a lug or lip thereon beyond the wall of the cylinder forengagement with a retaining shoulder in the bore in the casing.

More specifically, it is an object of this invention to provide acombined tumbler spring retainer and cylinder retaining member whichconsists of a stamping set into a recess in the cylinder wall in such amanner that it may be considered to be floatingly disposed and biased toa position projecting its stop lug or lip beyond the cylinder wall bythe reaction of the tumbler springs.

Another object of this invention is to simplify the construction of theindividual tumblers.

Still another object of this invention resides in the provision of anovel cap for the end of the casing which is formed as a die casting andincorporates as an integral part thereof a protective boss projectingforwardly to partially embrace the protruding end of the cylinder andthereby prevent access to the combined tumbler spring and cylinderretainer in the locked position of the cylinder.

With the above and other objects in view, which will appear as thedscription proceeds, this invention resides in the novel construction,combination and arrangement of parts substantially as hereinafterdescribed and more particularly defined by the appended claims, it beingunderstood that such changes in the precise embodiment of thehereindisclosed invention may be made as come within the scope of theclaims.

The accompanying drawings illustrate one complete example of thephysical embodiment of the invention constructed according to the bestmode so far devised for the practical application of the principlesthereof, and in which:

Figure 1 is a longitudinal sectional view through a lock deviceconstructed in accordance with this invention;

Figure 2 is a cross sectional view taken through Figure 1 on the planeof the line 2-2;

Figure 3 is a perspective view of the lock casing per se;

Figure 4 is a perspective view of the combined casing cap and boltretainer;

Figure 5 is a perspective view of the cylinder Figure 6 is a perspectiveView of the combined tumbler spring and cylinder retainer; and 30tumblers.

Figure 7 is a perspective view of one of the Referring now particularlyto the accompanying drawings, in which like numerals indicate likeparts, the numeral 5 designates the door of a glove compartment, onlythe upper wall 6 of which is shown.

Extending down from the upper wall 6 directly adjacent to the door frameis a striker plate or keeper 1 behind which a toggle-like latch bolt 8carried by the lock device indicated generally by the numeral 9 engagesto secure the compartment door 5 closed. The lock device 9 is mounted onthe door so that when the door is closed, the latch bolt automaticallyengages behind the striker plate or keeper.

The lock device comprises a casing l0 preferably formed as a die castingand having a bore I l to slidably and rotatably receive a lock cylinderl2. A longitudinal slot l3 through the top wall of the casingaccommodates the latch bolt 8. The sides of this slot 13 arelongitudinally grooved as at M to receive trunnions l5 formed asintegral parts of the toggle-like latch bolt. These trunnions are heldagainst the inner ends of the grooves l4 by-spaced arms 16 projectingrearwardly from and constituting an integral part of a casing cap IT.

This cap, like the casing, if preferably a die casting and has anannular part l8 from which the arms 16 project. The annular-part fitsover the front end of the casing where it is clinched in place. The capthus defines the mouth of the bore in which the cylinder is receivedwith its front end protruding therefrom to project from the front faceof the door panel as a push button.

The cylinder is also preferably die cast and has an open transversetumbler cavity I9 communicating with a longitudinal keyway 20. The sidewalls of the cavity have opposite grooves 2! extending across their fullwidth to provide tumbler guideways in which the side edges of tumblers22 ar slidably received.

At one edge of the cavity the cylinder is formed with bridges 23 whichextend across the cavity .between the tumbler, guiding grooves 2|, Thesebridges, together with a similarly located ledge (not shown) on theinner or rear end of the cavity. provide lands in position to collidewith spring rests 24 on the tumblers toalimit the stroke of .thetumblers under action of their springs 25.

The individual .tumblers, as best shown in Figure '7, arestamped fromflat band stock and have their medial'portions recessed or cut out atone edge to provide a key opening 26. The spring rests 24 areprojections-formed on the inner edges of the intermediate portions ofthe tumblers bent back 'ontothe intermediate portions as clearly shownso as to dispose the actual spring seats in line with the intermediateportions. The spring seats are pointed to enter the ends of the coilsprings andprevent displacement of the springs.

Heretofore, the tumbler springs were held in place either by individualretainers or a common retainer secured in the cylinder, but in allinstances in the past, the tumbler spring retainers were fixed .andgenerally were staked into the cylinder.

With the present invention, an entirely new form of tumbler springretainer is employed, and

as a result the functions of retaining the individual tumbler springsand also removably securing the cylinder in the casing bore are pergatedbar or strip 28 of a length greater than that of the tumbler cavity andhaving a plurality .of spring seats 29 formed thereon. These springseats may be roughly defined as teeth bent laterally from one edge ofthe bar 28 and to guard against displacement of the ends of the springsfrom these seats, their extremities are bent inwardly as at 30.

To accommodate the retainer 21, the cylinder has an open slot 31extending along one side of the tumbler cavity and continuing past thefront end thereof. This slot receives the fiat bar or strip 28 with thefront end portion thereof cate'dforw'ardly of the tumbler cavity.

At its rear end, the strip 28 has a projection 32 which enters a hole 33in the inner end portion of the cylinder which closes the rear or innerend of the tumbler cavity. In this position the retainer 21 has itsspring seats 29 disposed over the individual tumbler springs and as willbe readily apparent, is free to swing on the fulcrum provided by theengagement of the projection 32 in the hole 33.

The retainer is thus substantially floatingly mounted and is free tomove toward and from the surface of the cylinder in a directionsubstantialthe tumbler cavity, the retainer has a transverse arm 36extending laterally in the same direction as spring seats 29, and at itsextremity the transverse arm is bent down to form a fiat portion 31parallel with the bar and provided with an extension 38 which liesdirectly opposite the front end portion 34.

This extension 38 like the end portion 34 is engageable with the innersurface of the cap 35, and to guard against binding, the edges of theend portion 34 and the extension 38 which engage the cap lie in a planenormal to the plane of the bar or strip 28, and the location of theretainer is such that these edges engage the cap at points equidistantfrom a median longitudinal plane passing through the axis of thecylinder and parallel with the plane of the bar or trip 28.

On the rear edge of the transverse arm 36 is an outwardly bent lip 39.This lip, in the free position of the retainer, projects beyond thesurface of the cylinder to be engageable behind a shoulder 40 on thecasing cap I! to thereby removably hold the cylinder in the casing bore.

In assembling the cylinder with the casing the lip 39 on the sprinpressed retainer is cammed in over the edge of the shoulder 40 by a camsurface 4| formed at the junction of the face of the annular part I8with the cylindrical surface 42 of a boss 43 protruding from the frontof the casing cap. The cylindrical surface 42 is concentric with thebore and is somewhat larger in diameter than the bore which allows forthe annular chamfer which forms the ca surface 4|.

As clearly shown in Figure 4, the boss extends around only a portion ofthe'mouth of the bore and is in position to cover the exposed arm 36 ofthe retainer in the locked position of rotation of the cylinder. Hence,the retainer cannot be depressed to disengage its lip 39 from theshoulder 40 until the cylinder is turned to its unlocked positionwhereupon the exposed arm 36 is clear of the boss 43.

Moreover, even though through deft manipulation it would be possible todepress the free end of the retainer to disengage its lip 39 from theshoulder, removal of the cylinder could not be effected in the lockedposition of rotation as the projecting ends of its tumblers wouldcollide with the back of the annular part of the casing cap.

Rotation of the cylinder is limited to by the complementary shape of theinner end of the cylinder and the bottom of the casing bore. Also byvirtue of the relative shape of the inner end of the cylinder and thebottom of the bore, the cylinder cannot be depressed in the fashion of apush button in its locked position of rotation. It must be turned to itsunlocked position and when so turned the cylinder may be depressed torock the toggle bolt on its trunnions and retract the same fromengagement with the keeper or striker plate I.

As in the patent hereinbefore mentioned, the bolt is biased to itsoperative keeper engaging position by a spring 44. This spring pressesthe inner arm 45 of the bolt against the end of the cylinder and thuspushes the cylinder forwardly to hold the lip 39 firmly against theshoulder 40.

Attention is directed to the fact that the location of the fulcrum aboutwhich the retainer 21 swings lies inwardly, that is closer to the axisof the cylinder than the lip 39. lip 39 resulting from its engagementwith the shoulder 40 thus tends to rock the retainer toward operativeposition rather than camming it inwardly out of engagement with theshoulder, and it is also to be observed that the transverse arm 36 whichcarries the lip 39 is braced by its engagement with the walls of thecylinder recess in which it fits.

With the cylinder in its locked position of rotation, retraction of thebolt is positively prevented by a foot 46 formed on the bolt andengaging the side of the cylinder.

In its unlocked position, a recess 41 in the side of the cylinder alignswith the foot 46 to accommodate it and permit retraction of the bolt byinward depression of the cylinder in the normal manner.

If perchance the bolt spring 44 does not project the bolt to itsoperative position, turning of the cylinder to its locked position ofrotation positively earns the bolt outwardly as the end 48 of the recess41 rides under the foot 46 From the foregoing description, taken inconnection with the accompanying drawings, it will be readily apparentthat this invention provides a lock device especially adapted for use onglove compartment doors which has substantial advantages over similardevices heretofore in use in that it positively secures the toggle boltagainst retraction when the cylinder is in its locked position ofrotation and simplifies the design of the lock mechanism by combiningthe tumbler spring retainer and the cylinder retainer.

I claim:

1. In a lock having a bored cas ng, a cylinder and spring pressedtumblers carried by the cylinder and cooperating with the casing tosecure the cylinder against rotation: means for removably securing thecylinder in the casing comprisin a shoulder on the casing; a partconnected with the cylinder and restrained against endwise movement withrespect thereto but free to move radially, said part being engageablewith the shoulder and having'means reacted against by all of the tumblersprings so that the tumbler Pressure on the springs collectively biassaid part to its operative shoulder engaging position.

2. In a lock of the type having a casing and a lock cylinder removablymounted therein and equipped with spring pressed tumblers engageablewith the casing to secure the cylinder against rotation: a tumblerspring retainer assembled with the cylinder in a manner enabling limitedradial movement of a part thereof in the direction of the thrust of thetumbler springs so that said tumbler springs yieldingly project theretainer radially outwardly of the cylinder; and a shoulder on thecasing behind which a portion of said spring retainer engages to holdthe cylinder in the casing bore.

3. In a lock of the type having a casing and a lock cylinder removablymounted therein and equipped with spring pressed tumblers engageablewith the casing to secure the cylinder against rotation: a tumblerspring retainer assembled with the cylinder in a manner enabling limitedradial movement of a part thereof in the direction of the thrust of thetumbler springs so that said tumbler springs yieldingly project theretainer radially outwardly of the cylinder; and a shoulder on thecasing behind which a portion of the sprin retainer engages to hold thecylinder in the casing bore, said spring retainer being depressibleagainst the force of the tumbler springs to disengage the same from saidshoulder and free the cylinder for withdrawal.

4. A look of the type having a bored casing with a lock cylinderremovably mounted therein and equipped with spring pressed tumblerscooperable with th casing to secure the cylinder against rotation,characterized by the provision of: a common tumbler spring and cylinderretainer biased by the tumbler springs to a position operable to securethe cylinder in the casing.

5. As an article of manufacture: a lock cylinder having a keyway openingto a transverse tumbler cavity; tumblers slidable in said cavity;springs yieldingly biasing the tumblers to operative locking positionsfrom which they are retractible by a key inserted into the keyway; atumbler spring retainer carried by the cylinder and against which thetumbler springs react, said retainer having limited movement in responseto the thrust of the tumbler springs; and means on said spring retainerprojectable beyond the surface of the cylinder in response to the springthrust to provide adepressible cylinder retaining abutment.

6. In a lock: a casing having a bore and a cylinder retaining shoulder;a cylinder in the bore;

tumblers carried by the cylinder; spring means 7 biasing the tumblers tooperative cylinder securing positions; and a cylinder retainer having apart engageable with said shoulder and biased to its operative shoulderengaging position by said spring means.-

7. In a look: a cylinder having a bore and a cylinder retainingshoulder; a cylinder in the bore; tumblers carried by the cylinder;tumbler springs biasing the tumblers to operative cylinder securingpositions; a common spring retainer carried by the cylinder againstwhich all of the tumbler springs react; and means mounting said springretainer on the cylinder in a manner enabling a portion thereof at leastto move radially with respect to the cylinder, said portion having apart engageable with the cylinder retaining shoulder, and said reactionof the tumbler springs against the retainer biasing said part of theretainer radially outwardly into operative engagement with the shoulder.

8. In combination: a lock cylinder having a longitudinal keyway openingto a tumbler cavity; tumblers slidable in said cavity with parts thereofengageable by a key insterted into the keyway; individual tumblersprings biasing the tumblers to predetermined positions from which theyare retractable by the key; a single spring retainer mounted in thecylinder and extending past the tumblers providing spring seats againstwhich the individual tumbler springs react, said spring retainer havinglimited pivotal motion about one end thereof in the direction of thethrust of the springs so that the tumbler springs yieldingly urge theretainer toward the surface of the cylinder; and a part on said springretainer projecting above the surface of the cylinder to provide acylinder retaining stop abutment, said part being depressible below thesurface of the cylinder upon application of pressure on the retaineragainst the tension of the tumbler springs.

9. As an article of manufacture: a lock cylinder having a longitudinalkeyway opening to a transverse tumbler cavity; tumblers in said cavity;springs acting on the tumblers and biasing them to predeterminedpositions from which they are retractable by a key inserted into thekeyway; a single spring retainer mounted in the cylinder and extendinglongitudinally past the several tumblers with parts thereof providingspring seats against which the tumbler springs react; a pivotalconnection between one end of the spring retainer and the cylinderallowing pivotal movement of the retainer in the direction of the springthrust so that the tension of the springs reacting against the retainertends to project the retainer outwardly of the cylinder; a cap on theopposite end of the cylinder with a portion disposed over the adjacentfree end of the spring retainer to limit its spring propelled outwardprojection; and means on said spring retainer projecting above thesurface of the cylinder in the position of the retainer defined by itsengagement with the cap, said means providing a cylinder retaining stopabutment which is depressible below the surface of the cylinder bydepression of the free end of the spring retainer against the tension ofthe tumbler springs.

10. As an article of manufacture: a lock cylinder having a longitudinalkeyway opening to a transverse tumbler cavity; tumblers in said cavity;springs acting on the tumblers and biasing them to predeterminedpositions from which they are retractable by a key inserted into thekeyway; a single spring retainer mounted in the cylinder and extendinglongitudinally past the several tumblers with parts thereof providingspring seats against which the tumbler springs react; a pivotalconnection between one end of the spring retainer and the cylinderallowing 4 pivotal movement of the retainer in the direction of thespring thrust so that the tension of the springs reacting against theretainer tends to project the retainer laterally outwardly of I thesurface of the cylinder in the position of the retainer defined by itsengagement with the cap, said means providing a cylinder retaining stopabutment which is depressible below the surface of the cylinder bydepression of the free end of the spring retainer against the tension ofthe tumbler springs; and cooperating shoulders on the spring retainerand the cylinder adjacent to said projecting part to brace the retaineragainst force applied thereon axially of the cylinder.

11. In a lock of the type having a removable cylinder provided with aplurality of key operable tumblers: a combination tumbler springretainer and cylinder retaining member comprising, a stamping having aflat bar of a length to extend past all the tumblers in the cylinder,said fiat bar having one end formed to have a pivotal connection withthe adjacent portion of the cylinder, a plurality of spaced toothmembers projecting laterally from one edge of the bar to provide tumblerspring seats; and a laterally projecting arm on said edge of the barhaving an outwardly projected lip thereon for engagement with a stopshoulder on the casing in which the cylinder is mounted to removablyhold the cylinder in the casing.

12. In a lock of the character described: a combination tumbler springretainer and cylinder retaining member comprising: a stamping of sheetmetal having a flat bar with a plurality of comb-like teeth projectinglaterally from one edge to provide spring seats, and an arm projectinglaterally from said edge and terminating in a fiat portion parallel withthe bar, said flat portion and the adjacent end of the bar having edgeslying in a common plane normal to the plane of the bar to providelocating shoulders and a lip on said arm providing a shoulder engagingportion to hold the cylinder in the casing.

13. In a lock of the character described: a casing having a bore and ashoulder at the mouth of the bore; a cylinder in the bore; tumblerscarried by the cylinder; springs for the tumblers, said cylinder havinga longitudinal groove therein extending past the tumblers, the rear endof said groove being formed as a socket; and a combined tumbler springand cylinder retainer in the form of a sheet metal stamping and having afiat bar received in said groove with one end thereof hooked in thesocket so that the retainer has pivotal movement in its groove towardand from the cylindrical surface of the cylinder; projections on saidbar engaging over the tumbler springs so that the springs react againstsaid projections and yieldingly urge the retainer outwardly of itsgroove; means at the free end of the retainer limiting outward movementthereof; and an arm projecting laterally from the bar at its front endand having an outwardlylprojecting lip thereon engageable with saidshoulder to retain th cylinder in the bore, depression of the front endof the retainer against the tumbler springs disengaging said lip fromthe shoulder to free the cylinder for withdrawal.

14. In a lock of the character described: a cylinder having a keywayopening to a tumbler cavity and having a longitudinal slot parallel withthe keyway and extending past the tumbler cavity and having anothersimilar longitudinal slot at the opposite side of the keyway locatedonly at the front end of the cylinder, said slots being joined by atransverse recess at the front end of the cylinder which extends acrossthe keyway; tumblers in the tumbler cavity; individual tumbler springs;and a spring retainer in the form of a sheet metal stamping having afiat bar disposed in said first-named longitudinal slot and havingspring seats projecting laterally therefrom and disposed over thetumbler springs so that the tumbler springs react thereagainst andyieldingly urge the retainer outwardly of the slot; an arm extendinglaterally from the front end portion of the bar and disposed in saidtrans verse recess at the front end of the cylinder; a fiat portion onthe outer end of said arm parallel with the bar and disposed in saidsecond-named recess; an outwardly extending projection on said armproviding a cylinder retaining stop abutment; and means for holding theretainer assembled with the cylinder and limiting its tumbler springpropelled outward projection while permitting depression thereof todepress said cylinder retaining stop abutment beneath the surface of thecylinder.

'15. In a look: a casing having a bore; a lock cylinder mounted thereinand provided with spring pressed key operable tumblers j a tumblerspring retainer pivoted in the inner end of the cylinder and extendinglongitudinally past all of the tumblers to have its front endterminating adjacent to the front end of the cylinder; means on saidtumbler spring retainer against which the tumbler springs react in adirection tending to swing the front end of the retainer outwardly ofthe cylinder; means for limiting such outward swinging movement of theretainer; and a stop on the front end of the retainer projecting beyondthe surface of the cylinder in the normal free position of the retainer.

16. In a lock: a casing having a bore; a lock cylinder mounted thereinand provided with spring pressed key operable tumblers; a tumbler springretainer pivoted in the inner end of the cylinder and extendinglongitudinally past all of the tumblers, to have its front endterminating adjacent to the front end of the cylinder; means on saidtumbler spring retainer against which the tumbler springs react in adirection tending to swing the front end of the retainer outwardly ofthe cylinder; means for limiting such outward swinging movement of theretainer; and a stop on the front end of the retainer projecting beyondthe surface of the cylinder in the normal free position of the retainer,said stop being radially farther from the cylinder axis than the pivotedinner end of the cylinder so that pressure on said stop toward the rearof the cylinder tends to swing th retainer outwardly.

17. In a look: a casing having a bore; a cylinder in the bore providedwith spring pressed tumblers; a tumbler spring retainer mounted in thecylinder with its inner end pivotally connected with the inner end ofthe cylinder so that the retainer is free to swing about its inner endtoward and from the surface of the cylinder; means on the retainerproviding spring seats against which the tumbler springs react and bywhich the pressure of the tumbler springs acts to swing the retaineroutwardly of the cylinder; a finishing cap applied to the front end ofthe cylinder and having a part extending over the front end portion ofthe retainer to limit outward swinging movement of the retainer; and apart on the front end of the retainer projecting outwardly therefrom toextend beyond the surface of the cylinder in the normal free position ofthe retainer and provide a depressible stop engageable with a shoulderon the casing for removably securing the cylinder in the bore.

18. A look cylinder having a transverse tumbler cavity communicatingwith a longitudinal keyway, the opposite walls of the tumbler cavityhaving grooves forming tumbler receiving guideways; tumblers disposed insaid cavity with their edges received in the grooves, said tumblershaving portions projecting from their sides to provide spring rests;tumbler springs engaging said spring rests on the tumblers; meansagainst which said springs react to yieldingly urge the tumblers in onedirection and bridges between the tumbler receiving. grooves andextending across the cavity in line with said spring rests on thetumblers to be engaged thereby and limit spring propelled motion of thetumblers.

19. A look cylinder having a transverse tumbler cavity communicatingwith a longitudinal keyway and a slot extending beyond one end wall ofthe cavity to provide an undercut ledge, said tumbler cavity being openat the top and having spaced bridging members a ross the bottom, thespaces between said bridgingmembers providing for the projection oftumblers the side walls of the cavity having tumbler guiding grooves inline with the spaces between said bridging members; tumblers havingtheir edgesguided in said grooves; a spring rest projecting from oneface of each tumbler and disposed over the adjacent bridging member toengage therewith and limit endwise movement of the tumblers in onedirection; tumbler springs engaging said spring rests and yieldinglyurging the tumblers in said direction; a retaining memberin the open topof the cavity with one end thereof engaged under the undercut ledge; andspring seats on the retaining member against which the tumbler springsreact in a direction to hold the retaining member engaged with saidundercut ledge.

20. A look cylinder having a transverse tumbler cavity communicatingwith a longitudinal keyway and a slot extending beyond one end.

wall of the cavity to provide an undercut ledge, said tumbler cavitybeing open at the top and having spaced bridging members across thebottom, the spaces between said bridging members providing for theprojection of tumblers, the side walls of the cavity having tumblerguiding grooves in line with the spaces between said bridging members;tumblers having their edges guided in said grooves; a spring restprojecting from one face of each tumbler and disposed over the adjacentbridging member to engage therewith and limit endwise movement of thetumblers in one direction; tumbler springs engaging said spring restsand yieidingly urging the tumblers in said direction; a retaining memberin the open top of the cavity with one end thereof engaged under theundercut ledge; and spring seats on the retaining memberagainst whichthe tumbler springs react in a direction to hold the re- I taming memberengaged with the undercut ledge;

the spring rests on the tumblers having projections to engage in theends of the springs and the spring seats on the retainer having portionsengaging over the ends of the springs to hold the same against the sideof the cavity whereby said side of the cavity and the adjacent sides ofthe tumblers form spring guideways in which the springs are heldconjointly by the spring rests on the tumblers and the projections onthe retainer.

21. In a lock device of the character described: a casing having a boreopen at its front end; a finishing cap for the front end of the casingcomprising an annular part secured to the front end of the casing todefine the mouth of the bore; a boss on the front of said annular partextending partially around the mouth of the bore and having a curvedsurface concentric to the bore but of larger diameter, the juncture ofsaid curved surface with the face of the annular part being bevelled toprovide a cam surface leading to the mouth of the bore, and the back ofthe annular part adjacent to said bevelled cam surface providing ashoulder.

22. In a lock device of the character described: a casing having a boreopen at its front end; a cap on the front end of the casing, said caphaving an annular part secured to the casing and defining the mouth ofthe bore, the back of said annular part providing a stop shoulder; acylinder in the bore with its front end protruding from themouth of thebore; a spring biased cylinder retaining detent on the cylinderengageable behind said shoulder to removably secure the cylinder in thebore; and a boss protruding from the front of the cap, said boss havinga curved surface concentric to the bore but larger in diameter than themouth of the bore, said curved. surface covering the protruding part ofthe cylinder to prevent access to the spring biased. detent on thecylinder until the cylinder is turned to a position at which the detentis clear of said boss, and the junction of the curved surface of theboss with the face of the cap being bevelled to provide a cam leading tothe mouth of the bore for automatically depressing said detent duringinsertion of the cylinder into the bore.

EDWARD N. JACOBI.

